Portable chuck box



FIG. 1 is a front perspective view of a portable chuck box;

FIG. 2 is a front elevational view of the portable chuck box of FIG. 1;

FIG. 3 is a right elevational side view of the portable chuck box of FIG. 1;

FIG. 4 is a top plan view view of the portable chuck box of FIG. 1;

FIG. 5 is a left elevational side view of the portable chuck box of FIG. 1; and,

FIG. 6 is a front perspective view of the portable chuck box of FIG. 1, shown with a front door of the chuck box in an open position.

The broken lines are included for the purpose of illustrating portions of the chuck box that form no part of the claimed design. 

The ornamental design for a portable chuck box, as shown and described. 